Low-temperature Data for Carbon Dioxide

Abstract

We investigate the empirical data for the vapor pressure (154≤T ≤196 K) and heat capacity (15.52≤T ≤189.78 K) of the solid carbon dioxide. The approach is both theoretical and numerical, using a computer algebra system (CAS). From the latter point of view, we have adopted a cubic piecewise polynomial representation for the heat capacity and reached an excellent agreement between the available empirical data and the evaluated one. Furthermore, we have obtained values for the vapor pressure and heat of sublimation at temperatures below 195 right down to 0 K. The key prerequisites are the: 1) Determination of the heat of sublimation of 26250 J·mol -1 at vanishing temperature and 2) Elaboration of a 'linearized' vapor pressure equation that includes all the relevant properties of the gaseous and solid phases. It is shown that: 1) The empirical vapor pressure equation derived by Giauque & Egan remains valid below the assumed lower limit of 154 K (similar argument holds for Antoine's equation), 2) The heat of sublimation reaches its maximum value of 27211 J·mol -1 at 58.829 K and 3) The vapor behaves as a (polyatomic) ideal gas for temperatures below 150 K.

Phase equilibrium and metastability of liquid benzene at high pressures

“…This might be a feature of the high-pressure experiment data which sets limits to the use of Antoine's equation by contrast to the case of low-pressure and temperature data where Antoine's equation predicts with high accuracy the evaporation and sublimation curves on a wide range of temperatures. 34,35 In order to correlate the data, we have developed and used an equation including five free parameters, 36…”

Quantitative risk assessment of CO2 transport by pipelines—A review of uncertainties and their impacts

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“…In this study the thermo-physical data for CO 2 is taken from [28]. For the solid phase properties we use data from [29]. The release of CO 2 following a puncture or rupture is physically different and is consequently modelled differently.…”

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